2121022202009 has 4 divisors (see below), whose sum is σ = 2194160898660. Its totient is φ = 2047883505360.

The previous prime is 2121022201927. The next prime is 2121022202081. The reversal of 2121022202009 is 9002022201212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1621173202009 + 499849000000 = 1273253^2 + 707000^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121022202009 - 2²⁴ = 2121005424793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121022202309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36569348282 + ... + 36569348339.

It is an arithmetic number, because the mean of its divisors is an integer number (548540224665).

Almost surely, 2^{2121022202009} is an apocalyptic number.

2121022202009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2121022202009 is a deficient number, since it is larger than the sum of its proper divisors (73138696651).

2121022202009 is an equidigital number, since it uses as much as digits as its factorization.

2121022202009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73138696650.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 2121022202009 in words is "two trillion, one hundred twenty-one billion, twenty-two million, two hundred two thousand, nine".